Wrench.



W. A. MUFFAT.

WRENCH.

APPLIGATIQN FILED smmao. 190s.

Patented Apr. 6, 1909.

` ment of V-ocasin requires.

' durable without increasing thecost struction.

WALTER ANDREW MOFFAT, OF DENVER, COLORADO, ASSIGNOR TO THE BLICKE WRENCH MANUFACTURING COMPANY, OF DENVER; COLORADO.

WRENCH.

Specification of Letters Patent. Application led Septembet, 1908. Serial No. 456,579.

Patented April e, 1909.

To all whom it may concem:

Bc it known that I, WAL'rEn Asnnsw| Morrs'r, a eitizen'of the United States, residing at Denver, in the county of Denver and tate of Colorado, have invented new andi useful Improvements in'VVrenehes, of which the following is a specification.

Thisl 'invention relates to wrenches of that type havi ig fixed and sliding jaws, and one of its objects is Vto rovide a novel construction of means`for ocking the sliding jaw in ladjusted Lposition, and., permittin of the ready an convenient release an adjustsaid jaw to different positions as Another obiect of the invention is to pro; vide' removable -bearin vmembers for the faces of the jaws, Whichearin members 'are made of hard metal, thus ena ling the jaws to be made of comparatively soft metal, whereby the jaws are rendered strong and o con- The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference beim1r had to the accompanying drawing, in w ich:-

Figure 1 is a side elevation of the wrench with the jaws appearing inlongitudinal seetion. Fig. 2 is a side elevation thereof. In the ollowing specification I have used the terms front, rear, .upper, and lower, to respectively designate that part of the Wrench carrying the fixed jaw, that part of the wrench on which the handle is ormed or rovided, the toothed surface of the handle bar or shank, and the reverse surface of said bar or shank, in order that the relative arrangement of these and the cooperating parts may be delinitcly specified.

Referring to the drawing, 1i represents thc handle bar of the wrench, which is preferably of angular form in cross-section and formed at one end to provides. handle and rari-ying at its opposite end a fixed. jaw Il.

A movable i,aw 4, ol tl-forni, is amanfed to I eoperate with the fixed jew, and is provided with iront and rear straps or loops-5 and 6 slidably engaging the bar or shank l for the adjustment of said movable jaw toward and from the lixed aw.

A locking dog 7 pro'ects longitudinally through the straps 5 and (i andbetween the f saineand the upper edge of cross portion of the the shank l and is provided at its forward end with a notch or recess 8 located in its upper edfe and ar ranged to receive the upper cross abar of the strap 5. This slotted end of the dog forms a locking connection between the dog and strap 5, by which the dog is held from dislo cation, but at the same tnneis permitted to have a limited sliding movement on the shank toward and from the upper edge thereof. The rear end ofthe dog is forined to provide a handle 9, and at a point in advance thereof the dog is provided with a series of downwardly projecting locking teeth l0 adapted to engage a row or series of teeth 11 formed on the upper edge of the bar or shank l. The front surfaces of the teeth 10 are beveled or inclined, while-the rear surfaces of the fteeth 11 are correspondingly beveled or inclined, thus permittinthe jaw .to have aforward movement on t e shank for an instantaneous adjustment without .releasing the do while preventing rearward movement o thej is in lockingposition.

In order to normally hold the dog in looking position, a coil spring 12 is seated at its lower end in a seat or recess 13 formed in the upper face ofthe dog above the teeth '10 and is mclosed at its opposite end in the u per strap 6 which is c anneled or chambered for its rece tion, and by which the sprin is held from The pressure o the s ring hol the .dog downward with its teeth in locking position, so as to prevent casual retractioo the dog and rearward movement of the sliding jaw,

aw on the shank when the dog atA is Al'aeement..

but by pullin" u werd on the handle 9 the lug,r being preferably of angular form to hold.

the plate against possible rotary movement. The plate is detachabl y fastened m positionby a screw 17 workin the body of the jaw`and 'having its head in a threaded opening 1n countersunk in a recess in the front face of The oblique or beveled front face of thc movable jaw 4 is similarly provided with a recess 18 to receive a bearing plate 19 of hard metal. `The late and recess are of angular form to ho d said plate against rota movement, and the recess is rovided side walls to prevent lateral dloflection og the late. A screw 20 extends forwardly througli the jaw from therearside thereof and enters the plate to detachably fasten the same in position, the head ofthe screw being,r countersunkl in a recess in the rear of the aw, as illustrated in Fig-1. Ordinarily, the Jaws are made of soft metal and chilled or other- Wise treated to reduce hardened bearing faces, but these aces quick] become worn and indented and decrease t e effectiveness ofthe gripping action. The present construction provides hardened steel bearing plates or ac es for the jaws which may be employed for a long time without injury and which will enable a firm and stron:v nonslippinggripping action to .be obtained. 'lhe use of these lates obviat-es the necessity of hardening tllie jaws by chilling or other methodsand increases the period of usefulness of the Wrench Without adding tothe cost of construction thereof.

Havin thus fully'described the invention, what is c aimcdas new is 1. A wrench com rising a guidelshank, a fixed jaw carried thereby, a movable jaw having iront and rear straps sli'dably en I mg t e guide "shank, a pawl extend through the ,straps and having a notched fori ward end receiving and pivotally en aging the cross portion of the strap am? pro- 4vided with teeth or serrations to en age the serrated surface of theguide shanE, and a spring housed within the u per cross portion of the rear strap and caring on said dog to normally hold the same in locking position.

2., A wrench comprising a serrated ruide shank, a stationary jaw carried therehy, a movable jaw provided with front and rear straps engaging the shank, the rear strap being formed in its cross portion with a channel or chamber, a dog extendin longitudinally betweenvthe serrated side o the shank and the straps and through the latter, said dog having its forward end notched to receive and pivotally engage the cross portion of the front strap and and lprojecting locking teeth to engage the shan i, and a coil s ring ber or channel of t e rear on the jaw to normally lockingr position.

In testimony whereof I ailix my signature in presence of two witnesses.

WALTER ANDREW MOFFAT. Witn esscs F. VVHITEHEAD, A. P. MACKEY.

strap and bearing hold the same in aging.

its rear end. provided with a' handle4 housed in the cham- 

